Slapping the cookie!?.. sounds like the solo version of 'rough sex' hahaa. My dear I am not talking about dolls here, who needs the rest of the body besides the important orifices/protruberances... besides, before you know it the female version will have headaches and periods! I am talking about sophisticated machines like the Sybian, currently freaking expensive and (mainly) for the girls. Being a technical tinkerer I have built myself a device that sucks dick like a champion at the push of a button, variable speed, depth and stroke, continuous or pulsed vibration and electrostim included! Best of all it has endless endurance and never complains about lock-jaw or a load of jizz in it's mouth! (one downside is having to wash it when done)
Getting back to pros and cons of SP, whereas clit desensitization may be a risk for some women, "mental desensitization" is a major risk for us guys! Having less versatile physical equipment than the girls requires us to engage our imaginations a lot more in order to heighten arousal. This is the reason why porn has become more and more extreme. One particular fantasy works only for a couple of sessions before it becomes stale and we need to seek something more 'stimulating'. Techno-SP solves this dilemma in that the physical pleasure is great enough to eliminate the need for any accompanying fantasy. This bodes well for the future, as hopefully the current trend towards violent sex, extreme bondage and snuff videos etc dies out.
Elaborating on @toy's points, the human sexual dilemma starts in childhood: The male of the species actively trains himself to reach orgasm as quickly as possible so he's not caught in the act, mentally negating the journey and totally focused on the destination. The female at the same time actively trains herself to focus entirely on her clit as the source of arousal and orgasm, in the process developing a unique technique that absolutely guarantees the superiority of her own SP over anything anyone else (let alone an inexperienced male) could ever create for her! Could things go more wrong than that?!? We are breeding a race of premature ejaculators with anorgasmic partners!
So, where lies the solution? Education, I guess. So now we have to illustrate the whole concept of sexual interaction to pre-teens with booklets filled with little stick people doing the deed, showing little girls that their pussy has equal status to their clits and convincing little boys that their inadvertent hard-on is an invitation to an adventure and not something to be got over with asap. AAARRRRGGGHHHH!!!! Really cant see any of that happening soon, for obvious reasons. As for encouraging pre-teens to engage in partner sex as soon as possible, just voicing the idea makes me afraid of being arrested for tendencies, same goes for an adult providing hands-on education like some so-called "primitive" "un-cultured" tribes do.
I guess we need to accept that man's mental development lags far behind his technological progress.............